These are foods with low glycemic index and hence a large part of your dietshould comprise of these foods. Foods with a low glycemic index increase the blood sugar gradually and so are good for diabetics.
These are foods with a high glycemic index and they can escalate blood sugar levels faster than foods with a low glycemic index. Indulge in thse foods in moderation and only as an occasional treat.
These foods are best avoided as they can only cause harm to your health and have little or no nutritive values. These can escalate the blood sugar levels almost instantaneously.